AL-80B Instruction Manual
24
For your personal safety, please observe the following precautions:
1. NEVER defeat the interlock.
2. NEVER remove the cover with the amplifier connected to the power line.
3. ALWAYS allow several minutes for the capacitors to discharge after unplugging the
amplifier and before removing the cover.
4. ALWAYS select the high-voltage (HV) function of the Multimeter to check the high
voltage potential. Do not remove the cover if voltage is indicated.
5. ALWAYS ground the tube anode (top metal conductor) to the chassis before touching
anything inside the amplifier.
6. ALWAYS be cautious of heat. Many components inside the amplifier operate at high
temperatures.
7. NEVER make any unauthorized component or circuit modifications to this product. The
only acceptable source for modifications is Ameritron or a source approved by Ameritron.
Unauthorized modifications almost certainly will increase the risk of equipment failure or
personal injury.
The cover should be removed and a low value (40 to 500 ohm) two-watt or larger resistor should be
secured to the chassis. The other end of this resistor should be connected to the tube anode with an
insulated clip lead.
CAUTION:
NEVER ground the anode directly to the chassis without a series
resistor. Component damage may occur from the current surge.
Note:
This resistor is a safety device that must be installed when beginning service
work and removed when the work is finished.
Dust and dirt can be blown out of the amplifier with a shop vacuum or a high pressure air hose. A
soft bristle brush dipped in alcohol can be used to clean particularly dirty areas. If the amplifier is
operated in a dusty environment, a non-conductive low-restriction foam air filter can be placed over
the ventilation holes on the left side of the cabinet near the filter capacitors. Placing an air filter
over these air inlet holes will substantially reduce the amount of dust entering the cabinet. Most
hardware stores stock suitable air filter material that are used as replacement filters for window air
conditioners.
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